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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d60a44f9cf98550ca1f1bc178e861e59bbfef45fd061a7444e80fedf4a7a6b' 
  AND token = 'mDN5hs9HjKjh0cmZc2Zw41ikhwpsUCUM2soJ8hVoekQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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