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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9a17205950c535ccffd2f82a42c4976cdd62f460799f040aaaf669bbe2cac9' 
  AND token = '9ddq55U4yJE2y2LB3LiPI4Hx2JSN5tOu3EQSWMzduWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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