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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03b8768e615897275e09744fb2bb1a4cea2de229ce3a2cf1113ba9a1f7057a2' 
  AND token = 'zEFBOPZ6IGSsldFPo8hiy58qX1ZIRjP1TG9seMy1m0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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