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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77e46d00aeaaf5c9ab9e9a53b18e5a42358a1c9110383f1adc349a395fed433' 
  AND token = 'EnMjg2ZFQzemtauhbQE26mSe2klLmlJ6USINkXvKOfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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