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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd5f2d1cfc40f05fcc3127b6ad5e58a1b6b74ab6196230bc8d7a77f5ebdb0e8' 
  AND token = 'PQnvHmoYY/pPEWw6ouwjpYMq5eGB4b1uYSYlGNDt7pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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