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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b09107a7a102982b2b3ef9673209b12da3ef1efae0be3313f4ddd15c418d46' 
  AND token = 'C8kGNLUzT2FWx4tKIDe1QmHdKoYpSfyanMqzR/Qgo1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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