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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a38df25f3cd6ebbc412cd29a656ad7ce6bab41953dd14c64f1f3157fa53c8d' 
  AND token = 'Qc2X0JkeuVRcdoxILxwU5e367MKsBB9uNt87wY7moEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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