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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f4c74ed367655c9f874bbfe2c7e7d67078b02af2aa97b67c08adfc41831d39' 
  AND token = 'fYVaChzHmxmbiW8MVve/6ild3F+ngmGeIySIT2p/+NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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