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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6049f9b32858b80a4587ec5ac6620ded65c92961b7b13e2a5c9818b3e26fcc8c' 
  AND token = 'TEUy/U7GiFntaokctZMfdbs9bL54B17G/pDXIhFTHVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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