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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa45500b7cfdd4d6dad78e0c4c2c02c04b835904ef6b54e2de43336057fc8ad1' 
  AND token = 'cmIL3dnlzYuZWKB896jRIXTvpWLpan8U5RVcfvwIgHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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