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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660fb2b167512403277398ef2f67467b7895d8f3b998b2ef348bc2a75f61c535' 
  AND token = 'yMwQOaxhwcJVGZjDE8cDhfFEuST0Uyosfv2J2Skf2nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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