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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8668546f3edea2bd7b11e73f5d93912d277316625d0a8b9792797009d59867' 
  AND token = 'D+FJRum1jGZlSVXXuVuHYdhh1cLT5bpVyKyj202ptM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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