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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e7a0b0b2f833100f69b30ec634db2bbd70be7dd427321b09ef7e3329315233' 
  AND token = 'aunht7rRkcdr6eJfsfVXZQgwIDl/MUcnJm4HQ+11Usc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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