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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0032a2dcc66999121fe4e19487c97a3cc4650e35c102045f0ba323f76933d5' 
  AND token = 't4I/wheQxfsJb4wvyhqg/roArWnXlnz4wQS/18roN20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}