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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87d75cbe9fd3d8db981f5fd2538830aa0e47c2c622772770e2041311ad809f7' 
  AND token = 'nxiBWQ5SLmOlhulSl1MJtmu10O6KMWEUV+GTr2XGAho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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