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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a489d79d2c8b11943c5a86029c9def4c697f3acafe768046dd4952fe9f3f9c7' 
  AND token = 'oWWrDCgP5B5255FfNEmRCPo0uME3L1tCSy9oNs2+/uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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