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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc205388783987832ecd3079570904b186e794296eadd9a752857364c07eeba' 
  AND token = 'b9dS5DCII7Qsu5Q14JwG2B6+jG3NlQI78VoYv6wVlfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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