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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7496d556802ea5c9c9c43fe439fa7911d0d764c7803b61f73f870d87bab000c1' 
  AND token = '/JgRd/Mf+sYpIyWNJZNJ+5Jcd7sTYt0UidZd+He4al0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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