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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61e127c2983791b767e0719c6a22b8a12840456b6f5eec65ad95f2745158169' 
  AND token = '8/RykbfFcY3f2FKgJ963IFyDVQexJ5kVbjUlKKsrisA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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