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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8828cc736296b19285d89e9ced3452caf68f47eb99400a4eddb8c0c9319f2482' 
  AND token = '9yrbc+Ga38bUxxFF1QNFKKGQf3lYHivVsgJ0iMvx3yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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