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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f701335c6316c35f6423ce6db3626dac5fea7743956897f90283b3a67aa200d' 
  AND token = 'zg/zm16tBtTgNkpXR3W56+MdBgKQ6p5uNJRV3hnsb/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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