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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86fa417be96fa9c0377537aefe8c3a34a047514be792ae69964d9dff54331ba' 
  AND token = 'U5y695vRHVd0pPw8CpeV6AqL28k9vo5BFpsc4YxzcUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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