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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7045707f7e86333687772311d165c40a851bf6c21100807b742c357cbb5c257' 
  AND token = '9vnZONuWwfrf6Y7eXp7qU1SMzpUYbjPeZkddIEI33yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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