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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29889ce19a706d178d4bbc7caf61e69be87e13ae2916773241fcc54db9b5b8ed' 
  AND token = '4gZC3/O5UFFGy2Emo7GII+OMlVnm2Wbod2epy+Snr0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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