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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b322e58f530b91b6f97e561157b731c74d9ab2d5c2cb8e3660c595290d77c7f9' 
  AND token = 'eEdF2I1ZAvA6u9oIVN0ghq+j3qsNkKReKz4xrKIMdhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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