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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4d9158cec14fe2eb461e6a06cf142b44091d9c4781c63f6368241778c524cd' 
  AND token = 'A+kw6AHnknxz1nelukviqMmi5zcw6KbU4SglBXC3hss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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