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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbafcea19e9d188b999bece359123c1d679c3d2b0c64b8d3d7920539cae4e5f' 
  AND token = 'QDPluuUTo4rHnw7hB8pStQVc22DTY3q/cz3KJ7FT85Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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