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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e546195d13c4cb6b26df7cdb33ef9ab3c961a402881f98b68f8d131f3eb629' 
  AND token = 'ESSRNgSiogEDroFprhD2X3+e97ls6K6Rn4OsG6LY/qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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