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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9c861f4c16d8fc9ef0370c9c3aa3bc7c1b9e70ec5a815fc4c002994628ebfb' 
  AND token = 'pAoAXfpNugVR2tYakzxLBTVEUzKsaDqg4986aSp5Jow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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