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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20debe709144982cacf6f763bcdc79ec5ccb54a6ecc379c235156447100feb5a' 
  AND token = 'gejT13ZkKNfuX6pF2Ke3Sk9d6c/rANeQdWI0HY+ArR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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