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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6549a7001dc3058183afe142a9eeba77f718dba80bc2822b74567d6a89e1d9' 
  AND token = 'WNuz7I8Exc1drVsW+4ht3dqAnlc95oj0mKfZ6wfm2Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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