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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a884d185e5cfbc8905cff8306847166e8950719ab721290807a65791f1d89421' 
  AND token = 'Lmt4sXtcSsmRYxsxCI6vjeujZFC/uQubc23L9R/V83o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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