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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7b1a9ea1aac535e12d7ae946fdd36ad7db3cc3268dcdd928e0a84ddd44df09' 
  AND token = 'faWMKfM5Y4V5q598Q+fnyaT2lKh+u0GP+x2SSH20lRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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