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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12c3093e91f70ff8b6323d7c4b0c8879ee8fa7a3eb594e75a9076f28502a835' 
  AND token = '60vD7L+m4+85E0ZPSvZodGPyMwryWFHkPOw//jrFE4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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