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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fac2e263638f7b859c9127f6e623fbe96ea4ed7a330fa68b3ba5811f84198f2' 
  AND token = 'ssFiTCSTPwDb6X26scdontjsEw7Dqylu6JVl+M1P+MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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