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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e775015f8b61813635b1d833c367438f37edf8317df04d12fe0b947f8bcdc21a' 
  AND token = 'wVsjEUUVIwRPEX4aAugUSS7M97td8j5lW1HqTinaypQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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