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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05ec33a39386e7409d5f30ae5fd9385e8932fc59990119da0a6ed6cad9273a6' 
  AND token = 'cLnH6IKp25lPWWgBQZ12JlZAeKpsV1rm6UPiWlZnI1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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