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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44cff7b67bafeeec2cd0e25b7cd67cdcf28103ac3c9f88aa40d4096e0147d1d' 
  AND token = 'ltknPyQWypd7eKQAdIFdZErMhrtrFT7s9zKQ57jkeEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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