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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bc035b768b8bf7071b5cfa9bd14d8e2d21acf2989c2acaf580faa2b0ead18a' 
  AND token = 'ssyQAEE3DsK25bZS/3I3SovzmwEMMp0RBTAka2hM480=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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