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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c764a89ea48099d5850ab84b2e1de2b93fe69ab0970b39f64a79eba67df82017' 
  AND token = 'Gx9iQ31DIueYEfVTH+ABCYievpqm+IWbe9fv76aYEAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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