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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925202a2544130f3a81a143c0453354ab3d4b455b1765ba7b4bf0120760d8671' 
  AND token = 'c2GcCma61biBWHIJjh68xC2gx7wX6yCy7cizVfPK4WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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