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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24af3a1aafc7d173387c71597c37c24479c73083c69f770fc15b5d68b0f1655a' 
  AND token = 'Q/jJdg0eqR0h1G6/608ZLEpSQjncDLAb3ZbYWx7knMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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