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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1a7544da06b2b8df08fb96ee791c35413753d4a8d03649791700ea5d127f5e' 
  AND token = 'Tt/xCZTZXIgrOCvZIvkl1nbMswawyf784I0yzVahR8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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