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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685bf579d0ad45254ae91c70dcfd714860380648342f7419dc5455113960fb2a' 
  AND token = 'Vn02w/v17uwLSeLOBlTbw2h1Pzo1n09jaIF89p18cBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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