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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15951b6d909216fb3fe8eeff6f04be2f749c143bf9b05b8a4eed2c43f871911' 
  AND token = 'EWhs+gv1t20f01vXioQcSfYhsplrOm31mZuu+e7xn5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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