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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0420964791eecbf017f4eb578c0bfb5822895519853a73e4ed5499cc4161473' 
  AND token = '9eh8Dk/q5EtmoZTQeCdE909JQhy993EkztQI26raj4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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