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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7842cb729acdf9f11fcc27a4eb7fa6af2bad263dad7313d1d62df733cd4aa7' 
  AND token = '9u/ohaJwV8/NQmG/TvY8i5kgScFAUyhjp4wfRX4NYlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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