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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9de6761c014b1404e324b7e8bf94f400bcaaee85786cde7467aa201e96218d1' 
  AND token = 'byw3EY24vjjepuN2dMakzbrYt8n0w2x4vbWl6padZ4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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