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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887529d37e7d12e8ee1e6919b2c44d7318259383bc35c4e4b8f98d1d91c23b94' 
  AND token = 'VQ5pUXemGT31FJzAwQ7Kx9QZb8TAZqw3eovODyocW6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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