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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e890d4a87d2bc995ca383bfe689217086c2e22f02b1ae18ea185e125a7f759c9' 
  AND token = '7MRpJMt10o8Od/qiXqwK1MBilhq1vb9Hpn21sks5Fy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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