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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7814c885683b83730f8e25d7c38a5e076e58f3e7c663dac03ccbf73ce7b7f0e' 
  AND token = 'dm5+b+bc66WiI7BvQkrnkwrrZivWaLZcVSV5Pku8SY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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