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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc419af81436e05ac6b85170ce749e70358b0cd547c2946e25a5bca0b812760' 
  AND token = 'jB8Ju7jar5BLvx2864G6X8ac89Y3bq/lgoCxDotcVsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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